Prepare for custom channels (lnd v0.18.4-beta) #1931

Job	Run time
check commits	8m 28s
integration test	23m 38s
backend build on ubuntu-latest	8m 17s
frontend tests on ubuntu-latest	5m 5s
backend build on windows-latest	8m 9s
lint	2m 56s
frontend tests on windows-latest	9m 13s
RPC proto compilation check	3m 38s
backend build on macOS-latest	8m 7s
frontend tests on macOS-latest	5m 5s
check release notes updated	2s
unit tests	5m 25s
unit-race	5m 16s
	1h 33m 19s

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